Could not get lock /var/lib/dpkg/lock-frontend as checking system updates automatically

Run apt-get update but get the below when just powered on a Test Machine:

E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

 ps aux | grep -i apt  showing  /bin/sh /usr/sbin/apt/apt.systemd.daily install  running.

The system was checking updates automatically.

Update